The Order of the Arrow is Scouting's National Honor Society. Scouts are elected to the Order by their fellow unit members. To become a member, a youth must meet specific rank and camping requirements. Once elected, a candidate must complete an Ordeal weekend and may later seal his membership by converting to Brotherhood.

Del-Mar-Va Council's OA Lodge is Nentego Lodge. The lodge is part of Section NE-6A, which itself is part of the larger Northeast Region. The lodge is divided into chapters, corresponding with that council's districts. As such, all Troop 70 OA members are part of the Powder Mill Chapter.

Nentego Lodge holds two inductions weekends per year, which all OA members are encouraged to attend. These are held in October and April. A fellowship weekend is held in June; more often than not, this is an induction weekend also. These weekends are held at either at Rodney or Henson Scout Reservations. Additionally, the Lodge Banquet is traditionally held in February.

Powder Mill Chapter meetings are held the second Wednesday of every month at the LDS Church in Wilmington at 7:00 PM, coinciding with the monthly district roundtable. All OA members are encouraged to attend this, as well as other Chapter events, such as bowling nights andservice projects.

For more information on the basics of the Order, including the ordeal, Brotherhood membership, and Vigil Honor, visit here.